

package com.hazelcast.map.impl.mapstore.writebehind.entry;

import java.util.UUID;

/**
 * Mainly contains static factory methods to create various {@link DelayedEntry} instances.
 */
public final class DelayedEntries {

    private static final DelayedEntry EMPTY_DELAYED_ENTRY = new EmptyDelayedEntry();

    private DelayedEntries() {
    }

    public static <K, V> DelayedEntry<K, V> newAddedDelayedEntry(K key, V value, long expirationTime, long storeTime, int partitionId, UUID txnId) {
        if (txnId != null) {
            return new TxnAddedDelayedEntry<>(key, value, expirationTime, storeTime, partitionId, txnId);
        }
        return new AddedDelayedEntry<>(key, value, expirationTime, storeTime, partitionId);
    }

    public static <K, V> DelayedEntry<K, V> newAddedDelayedEntry(K key) {
        return new AddedDelayedEntry<>(key, null, Long.MAX_VALUE, -1, -1);
    }

    public static <K, V> DelayedEntry<K, V> newNullEntry(K key) {
        return new NullValueDelayedEntry<>(key);
    }

    public static <K, V> DelayedEntry<K, V> newDeletedEntry(K key, long storeTime, int partitionId, UUID txnId) {
        if (txnId != null) {
            return new TxnDeletedDelayedEntry<>(key, storeTime, partitionId, txnId);
        }
        return new DeletedDelayedEntry<>(key, storeTime, partitionId);
    }

    public static <K, V> DelayedEntry<K, V> emptyDelayedEntry() {
        return EMPTY_DELAYED_ENTRY;
    }

    private static class EmptyDelayedEntry implements DelayedEntry {

        @Override
        public Object getKey() {
            return null;
        }

        @Override
        public Object getValue() {
            return null;
        }

        @Override
        public long getExpirationTime() {
            return Long.MAX_VALUE;
        }

        @Override
        public long getStoreTime() {
            return -1L;
        }

        @Override
        public void setStoreTime(long storeTime) {

        }

        @Override
        public int getPartitionId() {
            return -1;
        }

        @Override
        public long getSequence() {
            return -1L;
        }

        @Override
        public void setSequence(long sequence) {

        }

        @Override
        public UUID getTxnId() {
            return null;
        }

        @Override
        public void setTxnId(UUID txnId) {

        }
    }

}
